Clarence j



(No Model.)

' 0.J.LVUTHER.

GRINDING MAGHINE.

\ PatentedNov 16,

NITED STATES PATENT Price.

CLARENCE J. LUTHER, OF POYNETTE, WVISCONSIN, ASSIGNOR TO THE O. J.

` LUTIAIER COMPANY, OF PORT WASHINGTON, WISCONSIN.

GRlNDlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 593,964, dated November 16, 1897.

Application filed April 19, 1897. Serial No. 632,763, (No model.)

-To a/ZZ whom, it may conoern:

Be it known that I, OLARENCE J. LUTHER, a citizen of the United States, and a resident of Poynette, in the county of Columbia and .State of Wisconsin, have linvented certain new and useful 'Improvements inGrinding- Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has for its object to simplify and cheapen the manufacture of machines especially organized for 'grinding' knife-sec-` tions on sickle-barsof mowers and reapers, as well as to increase their durability and provide for their utilization as grinders for edge-tools of various kinds other than those aforesaid. Hence it consists in certain peculiarities of construetion and combination of parts hereinafter set fortl With reference to the accompanying drawingsl and subscquently claimed.

Figure l of the drawings represents a side elevation of my improved grinding-machine, partly in vertical longitudinal Section, as indicated by lines 1 1 in Figs. 2 and 3; Fig. 2, a front elevation of a portion of the machine, partly in transverse section, as indicated by line2 2 in Fig. 1; Fig. 8, a plan view, partly in horizontal Section, as indicated by line 3 3 in Fig. 1; and Fig. 4 a rear elevation of a portion of the machine, partly in transverse Section, as indicated by line 4: 4 in Fig. 1.

Referring by letter to the drawings, A represents a cast-metal base provided at its corners with apertures for screws or bolts b, by which it may be made fast to a bencl or other support, if desired. Cast in one piece with the base A are a pair of upwardly-projecting lugs o and a transverse angular ledge B, the latter being provided with a V-shaped notch and having its upper surface beveled. The base ledge B projects under a grinding- Wheel, hereinafter particularly set forth, and constitutes a support for the sickle-bar of a mower or reaper, the bevel of its upper surface being such that the proper slant is given to said sickle-bar when the knife-sections thereof are being ground, the V-shaped notch in said base-ledge affording room for the grinding-wheel to move forward between a pair of'said knives whenroperating to sharpen the same. A pivot-rod C is run through the base-lugs c and other lugs d, depending from a cast-metal tilt-plate D, that is herein shown as having a wooden handle E attached thereto, although it may be found practical to cast the tilt-plate with a handle. The pivot-rod C is shown as having a head 6 at one end and its other provided with screwvided with a depending rear stop g, that comes v to rest on the base Awhen said plate is swung back, and projecting forward from said lug is shown an ear h, in which a stop-screw F has its adjustment with reference to said base,

whereby forward throw of the aforesaid tilt-l plate is regulated or prevented.

The tilt-plate is provided with a boss t' atl its upper end, and held fast in this boss by a set-screw j is a rod G, with which lugs 70 at the 'upper end of a preferably two-part grinding-wheel-supporting frame have pivotal connection. The rod G also constitutes an arborl for a loose spur-wheel H, of comparatively large diameter, that is provided with a'crank-handle I and has mesh with a pinion J, thatisfast to another arbor K, having its bearin gs in lower arms m of said frame. The pinion J has greater width of face than the spur-wheel H in mesh therewith, and provision is had for 'longitudinal play of the arbor K inv its bearings, so that the grinding-wheel L, fast on said arbor, may automatically adjust itself to knife-sections of a sickle-bar, supported on the base-ledge B, above 'specified, this grinding-wheel being of conical form in opposite directions .from its longitudinal center.

The upper part M of the frame, to which IOO driving-gear above specified and to compensate for Wear on the part of saidlgear.

A set-screw N has adjustment in the pivotal frame against a stud p on the forward side of the tilt-plate D, and thus said frame is set so as to insure of the grinding-wheel L` coming properly on its Work, it being understood that said tilt-plate and frame in piv-: otal connection therewith move together When the handle E is operated.

A spiral tension-spring P is connected at its ends to the tilt-plate and frame in pivotal connection therewith to insure pressure of the grinding-Wheel L when the latter is oper-` at-ing upon knife-sections of a sickle-bar,and it is to be observed that the spring has movementiwithisaid plate and frame, as Well as expansion and contraction, this being one of the particular features of my construction and arrangement of parts designed topreserve the normal tension of said spring 'While the spring P may be connected in Variousways to the tilt-plate and pivotal frame, it is preferable, as herein shown, to provide said plate and frame With apertures through which' the eye ends of said spring are passed an'd en gaged by transverse stay-pins r r', thev former pin being adjustable in two seriesof notches that fiank the longitudinal edges of the aperture in the aforesaid tilt-plate, this aperture being of greater length than the one in the .aforesaid frame. By the adjustment of the stay-pin 'r the tension of the spring P is reglated, and it is to be understood that thegreaterl the slant of said sprin g the greater resistance it has to the frame that is in pivotal connection 'with the tilt-plate,whereby thegrinding-Wheel is caused to exert correspondingly greater pressure on -sickle-bar ``knife-sections and more rapidly grind the same when the machine is in operation.

The V- slotted sickle-bar clamp-plate i Q herein shown has a longitudinal slot s, engaged by a pivot-studt on the cast-metal base of the machine, and a thumb-nut R is run on the screw-'threaded end of the stud against the clamp-plate to bind the latter iniworking position, thesickle-bar being steadied on the bevel-faced V-notched ledge of said base by transverse 'shoulders u, depending from said clamp-plate.

The proper adjustment of the stop-screw F w'ill prevent the grinding-wheel from coming into detrimental contact with the thumb-mit R Whenthe handle -E of the tilt-plate D is pulled forward, and this provision for limitingmovement on the part of said tilt-plate also prevents straining of the tension-,spring P, above specified.

'The arbor K, on Which grinding-wheel'L is made fast, is extended beyond one ofV the frame-arms in which it has bearing and pro vided .with a rigid eollar w, against which another grinding-wheel -S may be clamped by means of a-set-nutw, run on the screwthreaded extremity of -said arbor extension* the latter grinding-wheel being for work on edge-tools of various kinds other than knifesections of a sickle-bar.

The grinding-Wheel S is an attachment for the machine above specified, and it is not positioned on the arbor K When said machine is utilized for grinding knife-sections of a sicklebar, as otherwise it Would have detrimental contact with the ledge B, constituting part of the machine-base.

It being desirable to utilize the grinding- Wheel S, the set-screw F is adjusted to come against the machine-base and thereby prevent forward movement of the tilt-plate. It also follows that the set-screw N may be ad- `justed to elevate the frame that has pivotal adjustment of the frame, aspiral spring confl ``nected at its ends to said tilt-plate and frame to move therewith coincidentwith its eXpansion and contraction, a grinding-wheel having its arbor rotative in bearings constituting `parts of the frame, apinion fast on the latter arbor, and a drivin g `spur-wheel loosely mounted on the former arbor to: mesh'with said pinion.

,2. A grinding-machine having a tilt-plate provided .With a depending rear` stop that comes to rest on the base of the machine, an adjustable 4stop arranged to limit forward m ovenent of the tilt-plate,an arborsupported by the tilt-plate, a framehaving positive pivotal adjustment on the arbor, a spiralspring connected at its ends to :said tilt-plate and frame, agrindng-wheel having an arbor rotative in bearings constituting parts of the frame, a pinion fast on the latter arbor, a drivinggspur-Wheel on the formerarbor havingmesh With the pinion, a transverse beveltop V-notched ledge on the machine-base, and a clampmechanism fora sickle-bar supported on said ledge.

3. ya VA ,grinding-machine having a tilt-plate, an arbor-supported by the same, a frame having positive pivotal adjustment 011 the arbor, a spiral spring connected at its ends to the tilt-plate-and frame to move therewith coincident' With its-enpansion and contraction, a grindin'g-Wheel having an arbor in rotative connection withsaid frame, a pinion fast on the latter arbor, a driving-spur-Wheel on the former arbor in mesh With the pinion, la trans- .verse bevel-top V-not'chediledge on the machine-base, and a clamp mechanism for a sckle-bar'supported on said `lcdgc.

IOO

IIO

4:. A grinding-machine having a tiit-plate, an arbor supported by the same, a frame n positive pivotal adjustment on the arbor, a spiral spring having one end thereof in adjustable connection With the tilt-plate longitudinally of the same and its other end in nonadjustable connection with the frame although movable With both, a grinding-Wheel having an arbor in rotative connection With said frame, a pinion fast on the latter arbor, a driving spur-wheel on the former arbor having mesh With the pinion, a transverse beveltop V-notohed ledge on the machine-base, and a elamp In'eohanism for a siokle-bar supported on the ledge.

5. A grinding-machine comprising a tiltplate and means for looking the same in sWung-baok position, an arbor supported by the tiit-plate, a frame in spring connection With said tilt-plate and having positive pivotal adjustment on the arbor, a siokle-barsupporting ledge and olamp on the machinebase, an arbor rotative in the frame and having' one of its ends extended from said frame for the engagement of a detachable grindingg- Wheel when said tilt-plate is locked in swungback position, a grinding-whee1 fast on the frame-supported arbor for Work on sickle-bar knife-seetions when the aforesaid tilt-plate is free to be swung forward, a pinion fast on the latter arbor, and a drving spur-wheel loosely mounted on the forner arbor to mesh With the pinion.

In testimonythat I .claim the foregoing I CLARENOE J. LUTHER.

Wtnesses:

G. M. LUTHER, H. L. BUTLER. 

